Refrigerating apparatus.



Miami.

H. H. SOUTHWORTH & O. G.-ARMSTRONG. REFRIGERATING APPARATUS.A-PPLIGATION FILED NOV. 6, 1912.

Patented Sept. 1-, 1914.

2 SHEETSSHBET 1.

H. H. SOUTHWORTH & (1. G. ARMSTRONG. REFRIGERA'PING APPARATUS.

APPLICATION FILED NOV. 6, 1912.

1,109,021, Patented Sept. 1, 1914.

2 SHEETS'SHEET 2.

UNITE sTATEs PATENT orruon.

HARRISON H. SdUTHWORTH, 0F CLEVELAND, QHIQ, AND CHARLEg KBMSTRONG, OFATLANTIC HIGHLANDS, NEW JERSEY, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THEICELESS REFRIGERATION COMBANY, 0F CLEVELAND, OEIO. A CORPORA- T o v orOHIO.

Specification of Letters Patent.

nnrmennnrme APPARATUS.

' Pa ented Se 1.

I Original application filed June 1 4, 1912, Serial No. 703,596. Dividedand this application tiled November 6;

- 1e13 $erial n again.

hoga and State of Ohio, and of Atlantic l-lighlands, in the county ofMonmouth and State of New Jersey, have invented certain new and usefulImprovements in Refrigerating Apparatus; and we do hereby declare thatthe following is a full, clear, and exact description thereof, referencebeing had to v the accompanying drawings, and to the letters ofreference marked thereon, which.

. Fig. 4C is a view representing a vertical longitudinal section throughthe check form a part of this specification.

This invention relates to improvements in refrigerating apparatus of theabsorption type, and consists of the matters hereinafter described andmore particularly point- 5 the thermostatically controlled fuelgas suped out in the appended claims.

In carrying .out our inventlon, we provide a still and an absorber, andin addition another vessel adapted to act as an intermediary containerin the transposition of contents between the still and the absorber andlVhile the invention is not limited thereto Y we prefer to use water .asthe absorbent and ammonia as the refrigerant and in herein afterdescribing our invention we shall refer for convenience to suchabsorbent and re v y is intended to act as an absorber.

frigerant alone.

In the apparatus shown in the drawings;

the contents of the still are heated .to a predetermined temperaturecorrespondin with i and incucating that tne liquor there n hasbeenreduced to the intended stage of weakness, when the hot weak liquor isconveyed tainer to the absorber. ar provided between the several vesselsconstitutlng the parts mentioned and'automatic Suitable connections Idevices are provided to open communication betweenihe several vesselsreferred to so as to permit the interchange described.

L'lhe apparatus herein described is deslgned to carry out the processdescribed and claimed in an application filed by us on June 14th, 1912,Serial No. 703,596, of which the present application is a division.

In the drawings :-Figu re 1 is a view representing a vertical sectionthrough an apparatus made in accordance with our invention. Fig. 2 is aview representing a vertical central section through one of thethermostatically operated valves. Fig. 3 is a view representing avertical central section through another form of thermostaticallyoperated valves used in this apparatus.

valves located at the inlet end of the pipe, lead ng to the condenserreceiver coil. Fig. 5 1s a vertical longitudinal section through plyvalves: Fig. 6 is-a view representing a vertical central section througha third form of thermostatically operated valve used in the apparatus;

Referring now to the drawings, 10 indicates a still or generator whichmay be of any convenientconstruction and as shown consists of anelongated closed drum made of metal. This generator, as will presentlyappear, is heated during a time interval and then remains at rest duringa succeeding interval of time, when it is again heated, the intervalswhen it is acting as a still and when it is at rest alternating witheach.

other. '11 indicates arsecond drum which 12 indicates still another drumwhich, as will appear, acts, in the embodiment of the invention shown inthe drawings, as an intermediary container for receiving and holding theweak liquor during the transposition of the strong liquor from theabsorber 11 to the still 10.

13 indicates a condensing and receiving coil in which the ammonia gas iscondensed and retained and from which it passes to the refrigeratingcoils in a familiar manner. I

' In the absorption drum 11 is located a coil- 14, which, as shown,extends from end to end of said drum.

15 indicates an upright pipe leadingfirom the bottom of the still to thebottom of the -.ibsorption drum and being connected at the still endwith a short pipe 16 that projects into the still and at the absorberend with the inlet end 17 of the.coil 14. The outlet end 18 of the coil14 extends through the opposite end of the absorption drum 11 and isconnected to an upright pipe 19 leading to the intermediary drum 12 andconnected with a pipe 20 which extends longitudinally through the top ofsaid drum. Said pipe 20 has perforations 21 on its lower side. Theintermediary drum 12 is connected with the absorption drum 11 by anupright pipe 23 which connects at its upper end with a perforated pipe22 extending longitudinally through the intermediary drum near itsbottom and connects at its lower end with a pipe 25 extending into theabsorption drum 11 near its top.

26 indicates a normally open valve interposed in the pipe 23 andadapted, asshown herein, to be closed by a thermostatically operateddevice (the construction to be described more particularly later). Saidvalve controls the flow from the intermediary drum 12 to the absorptiondrum 11. 27 indicates a casing containing a diaphragm for operating saidvalve and 28 indicates a pipe communicating with said diaphragm casingand connected at its other end with a closed shell 29 surrounding thepipe 15 that leads from the still 10 to the absorption drum 11. Saidshell 29 is located near the lower end of the pipe 15 adjacent the pointwhere it is connected with the still 10. Said shell 29 and pipe 28 areadapted for containing an expansible thermostatic fluid which is readilyaffected by changes in temperature.

30 indicates a normally closed valve in terposedin the pipe 15 near thelower end thereof and adapted to be controlled by a diaphragm in acasing 31 connected by a pipe 32 with a pipe 33 extending into thestill. Said pipe 33 is closed at its inner end and contains athermostatic fluid adapted to be affected by changes of temperature. Asshown, the pipe 33 extends through a T-fitting connecting the pipes 15and 16 and through the pipe 16. The thermostatic pipe 33 is alsoconnected with a second pipe 34 opening into a casing 35 containing adiaphragm which controls the operation of a valve 36. Said valve 36controls the flow of fuel-gas from a supply pipe 37 to a burner pipe 38located below the still.

39 indicates an ammonia. gas discharge pipe in the top of the still,open at its inner end and projecting through the end' wall of the still.Said discharge pipe connects with a pipe 40 which is connected by aT-fitting 41 with a pipe 42 leading to the condensing and receiving coil13. .The pipe 42 is also, as shown herein, connected by the T-fitting 41with a pipe 43 which connects with the pipe 25 in the top of theabsorption drum 11. As shown, the connection is made by a T-fittingwhich also connects the pipe 25 with the pipe 23 that leads from theintermediary. drum 12.

44, 45 indicate check-valves located, respectively, in the pipe 40 andin the pipe 43 on each side of the T-fitting 41 connected to the pipe 42which leads to the condensing and receiving coil 13. Each check-valve isadapted to permit a flow toward the pipe 42 but to prevent a return flowtherefrom.

A pipe 46 leads from the outlet end of the condensing and receiving coil13 to the refrigerating coils (not shown) and a return pipe 47 leads theexpanded ammonia gas from said refrigerating coils to the absorptiondrum 11, being connected to a perforated suction pipe 48 located nearthe bottom of the absorption drum and as shown extending through thecoil 14 therein.

The absorption drum 11 and the still 10 are connected by a pipe 53,which hasconnection at its upper end with a pipe 54 that opens into theabsorption drum near its bottom and has connection at its lower end witha pipe 55 that opens intothe still near its top.

56 indicates a valve interposed in the pipe 53 to control the flowtherethrough. As shown herein, said valve is thermostaticallycontrolled, 57 indicating a casing containing a diaphragm for operatingsaid valve 56 and said casing being connected with a pipe 58 containinga thermostatic fluid and having an end 59 extending into the absorptiondrum 11. The end of said thermostatic pipe extends through a T-fitting60, that connects the pipes 53 and 54, and through the pipe 54. I

The liquid ammonia receiving coil, the absorption drum and theintermediary drum 12 are inclosed in a tank 49 adapted for containingcooling water. Cooling water is supplied from a pipe 50 which extendslongitudinally above the intermediary drum 12 and is provided withperforations through which the water is discharged on said intermediarydrum. As shown, the drums 12, 11 and the condensing and receiving coil13 are arranged one above theother and the water which drips upon theintermediary drum in the first. instance falls from that into the tank49 and keeps the water at such level therein that the coil 13 and theabsorption drum 11 are covered. An overflow pipe 52 is provided in thetank 49 at a level slightly above the top of the absorption drum 11. v

I Referring now'more in detail to the several valves mentioned, theValve and casing 26 and 27 are as 'follows, the same being shown invertical central section in Fig. 2:

The valve 26 consists of a tube 61 in the lower end of which is secureda tubular valve block 62 having at its upper end a valve seat 63. Saidvalve seat is preferably made of case-hardened steel and is adapted toseat a ball 64 fixed to the lower end of a rod or stem 66. The pipe 23leading to the drum 11 is secured to the bottom of the tubular valvecasing 61 and the pipe 22 is secured to the side of said casing andopens into the same above the valve seat 63. A flow of the contents ofthe intermediary drum 12 to the absorber drum 11 by gravitation when thevalve is open is thus made possible. Above the ball there is formed inthe valve casing 61 a partition 65 having an aperture through which thevertical rod or stem 66 extends. 67 indicates a washer or plug of softelastic material through which said valve stem extends, and 69, 68indicate metal washers located, respectively, at the upper and lowerends of said plug 67. To the upper end of the valve casing 61 is securedthe diaphragm casing 27 which comprises upper and lower members 70, 71provided with annular flanges which are secured together and whichconfine between them a diaphragm member 72. The thermostatic pipe 28 isconnected to the upper casing member so that the thermostatic fluid insaid pipe will come in contact with the diaphragm 72. 7 3 indicates aspring interposed between the top washer 69 and a plate 74 thatiengagesthe bottom of the diaphragm 72. Said spring acts normally to hold theball 64 above its seat. When, as will presently be described, thetemperature of the thermostatic fluid in the pipe 28 is raised to apredetermined point, said fluid will expand through the tube 28 and inthe chamber above the diaphragm 72, depressing said diaphragm and withit the stem 66, causing the ball 64 to close on its seat 63.

Fig. 3 shows a vertical central section through the valve 56 and thecasing 57. In this case, the valve consists of a tubular valve casing 75containing within it an apertured valve plug 76 having formed at itsupper end a sefit 77adapted to seat a ball-valve 78. Said valve plug hasa lateral port 79 which is arranged in line with a pipe 53 openinglaterally into the tube casing 56 and forming part of the pipeconnection 53 between the absorption drum 11 and the still 10.80-indicates a washer threaded into the lower end of the tubular casing7 5 in engagement against the bottom of the valve plug 76 and adapted torecelve the thrust of an upper washer 81 at the upper end of a block orlug 82 of soft elastic material through w ich a vertical valve stem 83extends. 84 indicates a lower washer.

lower endof the tubular valve casing 75 is secured the diaphragmc'asing57, the same comprising upper and lower members 86, 87 which haveannular-flanges ecured together To the and confining between them adiaphragm ,88. A spring 85 extends between the lower washer 84 and adisk 89 which engages the diaphragm. .58 is secured to the casing member87 and opens into the diaphragm chamber below jthe diaphragm 88.- Toprevent the tubular valve plug- 76 from rotating in the valve cas- .ingand taking its port 79 out of alinement with the pipe 53*, a set-screwis threaded {through the tubular wall of the casing 56 and Thethermostatic pipe or tube engagedin a recess in the side of the tubular:valve plug, WVhen the thermostatic fluid in the pipe 58 is at normaltemperature, the

valve stem 83 is held by the spring 85 in a position below the ball 78so that it has no effect thereon, the ball simply resting upon its seatand acting as a check-valve to prevent a return flow from the stilltoward the absorption drum 11. When the thermostatic fluid is heated toa predetermined point so-as to act upon the diaphragm 88 the stem 83 israised slightly and the ball 78 .raised from its seat, thus permitting afree How from the absorption drum toward the still.

The construction of the valve 30 and diaphragm casing 31 (see Fig. 6) issubstantially identical with that just described, except that the ball78 is fixed to the upper end of the stem 83, so that the ball moves onlywith the stem. Then the thermostatic tube 33 is heated to apredetermined temperature, the valve, normally held closed by theassociated spring, is raised from its seat so as to permit a flow fromthe still through the pipe 15 to the coil 14 in the absorption drum.When said thermostatic tube cools down again, the spring lowers the stemand with it the ball, which is held against its 105 seat by the spring.

The checks 44 and 45 are shown in Fig. 4 and are of familiarconstruction comprising each a casing 90 containing a dividing wall seat92 on which seats a ball-valve 93. Said .valve' each permit a flowtoward the pipe 42 br prevent a back-flow from said pipe.

The gas controlling valve 36 is shown in section on the left in Fig. 5.familiar construction including a valve casing 94 containing a dividingwall 95 provided with a port and valve seat 96. 97 indicates a valvedisk on the end of a stem 98 which is operated by a diaphragm 99 in the13 diaphragm casing 35 which. is similar to those just described. Asprmg100 acts to normally hold the valve stem in such posi- 91 having a portwith a knife-edge valve n This is of tion that the valve 97 is off itsseat and the parts are so adjusted that when a certain V predeterminedtemperature is reached by the thermostatic fluid in the pipe 33 and 34the valve is closed upon its seat thus shutting oif :the gas'supply.-The valve disk 97 is provided with an aperture 101 adapted to permit asmall flow ofgas even after the valve is closed so as to retain a pilotflame in the burner 38.

The operation of our improved apparatus i is as follows: At thebeginning of a cycle the still 10 is charged with strong liquor, theabsorption drum 11 contains weak liquor and the intermediary drum 12 isempty. The ammonia gas which has passed through the refrigerating coilsand is returning through the pipe 47 enters the suction pipe 48 in theabsorption drum and is absorbed by the weak liquor therein. Acheck-valve 47 in the pipe 47 which is preferably of the sameconstruction as the check-valves illustrated in Fig. 4, permits a freeflow toward the suction pipe but prevents a back-flow from the pipe 48to the pipe 47. The thermostatic tube 38 being yet below thepredetermined -mnerature at which. it acts on the diaphragm 99 in thediaphragm casing to close the gas supply valve, said valve is open fullyand the burner 38 is burning at full power below the still. .Thepositively closing'valve 30 in the pipe 15 controlling the connectionbetween the still and the coil 14 in the absorption drum is closed andthe valve 56 controlling the flow between the I still and the absorptiondrum is on check so lVhen a predetermined temperature as to prevent aflow from the still to the abconnecting the intermediary drum 12 withthe absorber drum 11 is open. The still and the absorber continue to actin their respective capacities as such,-ammon1a gas belng driven offfrom the still and the ammonia gas coming from the refrigerating coilsbeing absorbed by the liquor in the absorption drum. The ammonia gasdrlven from the still passes through the pipe 39, the pipe 40,

the check-valve 44 and down through the pipe 42 to the condensing andreceiving coil 13. The check-valve 45 prevents the ammonia gas fromgoing beyond said valve. is reached in the still 10 corresponding to theweakness of liquor the apparatus is designed to work with, thethermostatic fluid in the pipe 33 expands through the pipe 34 into ;thediaphragm casing 35, depresses the diaphragm against the action of thespring and causes the fuel gas supply valve to close on its seat, thusturning down the burner to pilot flame. At the same time saidthermostatic fluid expandsthrough the pipe 32"into the diaphragm casing31, raises the stem 83 and lifts the ball 7 8 from its seat,'thuspermitting a free passage of the hot weak liquor through the pipe 15toward the coil 14. The passage of the hot weak liquor through the pipe15- and through the thermostatic casing 29 connected with thethermostatic pipe 28 raises the temperature of the thermostatic fluidtherein, which expands into the diaphragm casing 27 and causes thediaphragm 72 to depress the stem 66 and close the balltermediary drum,through which it is discharged into said intermediary drum. As the valve26 is now closed as has just been described, the weak liquor is retainedin said drum. As the hot weak liquor passes through the cold liquor inthe absorption drum 11, which has now approached the point ofsaturation, the temperature of said liquor is raised by reason of theheat conveyed from the hot weak liquor to'the coil 14, and this rise oftemperature increases the pressure in the absorber 11 and iscommunicated to the end 59 of the thermostatic tube 58, thus causing anexpansion of the thermostatic fluid in said tube which acts on thediaphragm in the casing 57 and causes the valve operating stem in saidcasing to rise and lift the ball-valve from its seat, thereby openingcommunication between the absorption drum 11 and the still 10. In thepas- -'vac1ium extending back through the pipe 19,

coil 14 and pipe 15 to. the still 10. The pres sure in the still, fromwhich substantially all of the hot weak liquor has been discharged,being comparatively much lower than that in the absorption drumcontaining the now hot strong liquor under pressure, substantially allof said strong liquor flows rapidly from the absorption drum into thestill 10. In the meantime, that is to say, in the interim between thepassage of the hot weak liquor through the coil 14 and of the raising ofthe temperature of the thermostatic member 59 so as to open the valve 56as just described, the thermostatic tube 33 has been cooling so thatwhen the comparatively cooler liquor from the absorption drum comes intothe still and into contact with the thermostatic tube 33, thetemperature of the thermostatic fluid therein is lowered so that thepressure in the diaphragm casing 31 is no longer capable of holding theball valve off its seat against the action of the associated springwhich resists the upward movement of the stem, and such ball valve isclosed on its seat and again acts to prevent the flow of liquor from thestill through the pipe 15. Very soon afterward the thermostatic casing29 has become cool, the pressure on the associated diaphragm isrelieved, and the ball of the valve 26 islifted from its seat by the 1'associated spring, thus opening communication betweenthe'intermediary-drum 12 and the absorber 11. When the valve 26 isopened as already described the ammonia gas in the absorber-l1, beingunder high pressure, rushes into the container 12 through the pipe 23and perforated pipe 22 and being rapidly absorbed by the weak liquortherein, a balance of pressure between the absorber and the intermediarycontainer is produced, whereupon the Weak liquor flows by gravity intothe absorber, and there acts in the usual wayto absorb the ammonia gasreturning from the refrigerating coils. We now have weak liquor in theabsorber drum 11 ready to absorb the ammonia gas returning from therefrigerating coils and'strong liquor in the i still 10 ready tobe'heated to drive off ammonia gas to the liquid receiving andcondensing coil 13, and the pressure in the diaphragm casing 35 and thediaphragm controlling the fuel gas supply'valve 36 having been relievedat about the same time that the pressure was relieved in the diaphragmcasing 31 to permit the closing of the valve 30.the burner 38 is againburning with full power under the still 10 and we have the sameconditions with which we started the operation, as first described.

The connection of the pipe 25 in the top of the absorber drum 11 throughthe pipe 43 with-the pipe 42 leading to the receiving coil 13 is made asherein described, so that in case excessive pressure is developed in theabsorber drum 11, during the time that the hot weak liquor is passingthrough the coil 14, that is to say a pressure above condenser pressure,this pressure may be relieved by a fiow of ammonia gas through the pipe43 to said receiving coil.

In order that the work of the still and of the absorber ma be as nearlyas possible balanced so that the liquor in the still will 'on therig tin Fig. '5) andflbeing substantially like the fuel gas supply valve 36,except that the position of the valve disk 97 is placed on the side ofits seat opposite to its stem 98 and the pressure of the spring thusacts to close the valve, while the pressure in the diaphragm tends toopen the valve. A casing 106 -is connected with the casing of said valveand contains a diaphragm for operating said valve. A pipe 105 connectssaid diaphragm casing with the top of the intermediary drum 12. As thepressure in the intermediary container drum 12 except when the valve 26is closed, is the same as the pressure in the absorber drum 11, thepressure in the pipe 105 always rep- :resents the true back pressure.Should the absorption'in the drum 11 at the beginning of the cycle be sorapid that a very low pressure-exists in said drum, that is to say, a

pressure below a predetermined low point,

i this pressure in the pipe 105 and in the casing 106 will not besutficient to overcome the .action of the associated spring whichnormally tends to close the valve, so that said spring will hold thevalve'disk of the valve 107 closed on its seat, thus cutting off thefuel gas supplyto the burner 38, (except an .amount suflicient to supplya pilot llama) .notwithstanding the fact that the valve 36 is open.Soon, however, as the pressure in the absorber rises above thispredetermined low degree of pressure, indicating that it is catching upin its work with thestill, the back pressure in the pipe 105 will besuflicient to overcome the spring and raise the valve disk of the valve107 from its seat,

thus eliminating the valve 107 from the operation of the apparatus.

While we have shown herewith a thermostatic device for opening the valve56, to

permitthe strong liquor to pass from the absorber to the still, suchthermostatic device is not essential to the operation of the apparatus.and an ordinary, check-valve,

such, for example, as one ofthe check-valves shown in Fig. 4, may besubstituted. In this case the valve will be so arranged that it willcheck and prevent the flow from the still toward the absorber, but, willpermit a flow from the absorber-to the still when-- ever the pressure inthe absorber is greater than that in the. still. Thus,as alreadydescribed, after the hot weak liquor has passed to the intermediarycontainer and a partial vacuum has come to exist, as described in thestill 10, the comparatively greater pressure produced in the absorber,by reason of the will force the valve open and produce; a movement ofthe contents of the absorber to g the still.

Whileindescr'ibing our novel apparatus for carrying-out our process, wehave referred-to certain details of mechanicalconstruction andarrangement, it will be understood that We are in no way limited theretoexcept asmay be pointed out in the appended claims.

I We claim as our invention 1. In an absorption refrigerating apparatus,in combination, a vessel adapted to act as a still, a vessel adapted toact as an absorber, an intermediary container adapted to receive thecontents of one vessel while a 1 mediary container, means for impartingthe temperature of the weak absorbent after it has "left the still tothe strong absorbent to drive said strong absorbent into the still,devices for controlling the flow through said conduits, and means fordiscontinuing the generation from said still when the absorbent thereinhas been reduced to a predetermined degree of weakness.

3..In an absorption refrigerating apparatus, in combination, a still, anabsorber, an intermediary container, means for heating said still,conduits connecting said still, absorber and container adapted to ermittransposition of the contents of the still and absorber through themedium of said intermediary container, means for imparting thetemperature of the weak absorbent after it has left the still to thestron absorbent to produce the pressure require to drive said strongabsorbent into the still, and devices 1 for controlling the flow throughsaid conduits.

4. In an absorption refrigerating apparatus, in combination a still,means for heating said still, an absorber, and an intermediarycontainer, and means for producing a transmission of contents from t estill to the container, from the absorber to the still and from thecontainer to the absorber when the contents of the still have beenraised to a predetermined temperature, said transmission being separatedby time intervals.

5. In an absorption refrigerating apparatus, in combination, a still,means for heating said still, an absorber, and an 1ntermediarycontainer, and means for automatically producing a transmission ofcontents from thestill to the container, from the absorber to the stilland from the container to the absorber, when the contents of the stillhave been raised to a predetermined temperature.

6. In an absorption refrigerating appa= ratus, in combination, a still,means for heating said still, an absorber, an intermediary container,means for cooling said absorber and container, and means forautomatically producing a transmission of contents from the still to thecontainer, from the absorber to the still and from the container to theabsorber, when the contents of the still have been raised to apredetermined temperature.

7. In an absorption refrigerating apparatus, in combination, a still,means for heating said still, an absorber, an intermediary container,means for cooling said absorber and intermediary container, and meansfor automatically producinga transmission of the contents from the stillto the container, from the absorber to the still and from the containerto the absorber, when the contents of the still have been raised to apredetermined temperature, and means for automatically discontinuing theheating of said still in the interval between the time when it hasattained said predetermined temperature and the time when it hasreceived the contents of said absorber.

8. In an absorption refrigerating apparatus, in combination, a still, anabsorber, and an intermediary container, means for cooling said absorberand intermediary c0n-.

tainer, means for heating said still, conduits connecting said stillwith said container,

.said container with said absorber, and said absorber with said still,the conduit connecting-the still and the container being adapted toimpart its temperature to the contents of said absorber, devices forcontrolling the flow through said conduits, means for discontinuing theheating of said still when the absorbent therein has been reduced to apredetermined degree of weakness, and thermostatic devices depending fortheir operation on the varying temperature of the absorbent foractuating said controlling devices for producing a transmission ofcontents from the still to the container, from the absorber to the stilland from the container to the absorber.

9. In an absorption refrigerating apparatus, in combination, a still, anabsorber, and an intermediary container, means for cooling said absorberand intermediary container, means for heating said still, conduitsconnecting said still with said container, said container with saidabsorber, and said absorber with said still, devices for controlling thefiow through said conduits, the conduit connecting said still and saidintermediary container, including a coil located in said absorber, means.for discontinuing the heating of said still when the absorbent thereinhas been reduced to a predetermined degree of weakness, and thermostaticdevices, associated respectively with said still,

said absorber and said intermediary container, said thermostatic devicesdepending for their operation on the varying temperature of theabsorbent for actuating said controlling devices for producing atransmission of contents from the still to the container, from theabsorber to the still and from the container to the absorber.

10. In a refrigerating apparatus, in combination, a still, an absorberand an intermediary container, means normally open connecting the stillaudintermediary container including a device for communicat ingtemperature from the fluid passing from the still to the contents of theabsorber, means for opening communication between the still and theintermediary container, when the contents of the still have reached apredetermined temperature, means connecting said intermediary containerand said absorber, means for positively closing communication betweenthe intermediary container and the absorber when said predeterminedtemperature is reached, and means for opening communication between theabsorber and the still when the contents of the absorber have reached apredetermined temperature.

In testimony, that We claim the foregoing as our invention, We aflixoursignatures in the presence of two witnesses, the said HAR- RISON H.SoU'rHwoR'rH at Cleveland, Ohio, this 30th day of ()ctober, A. D. 1912,and the said CHARLES G. ARMSTRONG at New York city, New York, this 1stday of No- 35 vember, A. D. 1912.

HARRISON H. SOUTHWORTH. CHARLES G. ARMSTRONG.

Witnesses to the signature of Harrisol H. Southworth:

, H. A. HAUXHURST, C. SAEGER.

Witnesses to the signature of Charles G, Armstrong:

- ALIoE L. MCELWAINE,

HOWARD HIPKINS.

